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Dirichlet beta function : ウィキペディア英語版 | Dirichlet beta function
In mathematics, the Dirichlet beta function (also known as the Catalan beta function) is a special function, closely related to the Riemann zeta function. It is a particular Dirichlet L-function, the L-function for the alternating character of period four. ==Definition== The Dirichlet beta function is defined as : or, equivalently, : (proof ) Another equivalent definition, in terms of the Lerch transcendent, is: : which is once again valid for all complex values of ''s''. Also the series representation of Dirichlet beta function can be formed in terms of the polygamma function :
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